Just wondering, also, anyone know the torque for this ulev engine, all i find is that it's 2 less hp than the non ulev but everywhere i search but i can't find the torque numbers and i was just curious. ya it's a stupid question but whatever, im bored.

 

i believe it kicks in around 3600, dont quote me on that tho. and the torque rating is more than likely not too much lower than the f23a1.

 

go to edmund.com

it's called variable vtec, the ecm monitor the oil pressure, temp, throttle position,etc before letting vtec cross over.

if you drives like grand ma you can't even feel it

 

thank god i dont drive like granny, but the thing is about the torque question i was confused, cuz when i first got the car i raced a stick 01 altima and from a red light and i didnt even peel at all but ever since i have, and my friends were sure that the torque wasnt that much cuz i told them that it's 152 (accidentally thinking about the non-ulev) and that it's more than the hp but they didnt believe me. but thanks neway, once i boost this **** wont even matter

 

hate to say it, but 152 aint much torque to begin with... but yeah, turbo will fix ur problems.

 

ya i no 152's still weak and my ulev's probably weaker but what my friends were saying were taht it's like really bad, and i just had to stand up for the accord. i got enough money for a drag4 turbo but then im broke and got nothing else whatsoever that i could get to improve boost, engine management, better fuel injectors, etc., but hopefully things'll go my way.

 

dont put a turbo on there until you can do it right... study and research as much as you can while you save up enough to do it right. just remember after you put a turbo on there ur gonna want to tune it so it wont blow ur engine up. tuning is vital.

 

anyone have a specific tuner they'd like to recommend in southern california?

 

Just to complete the thread, answering the OP's original question, with the throttle planted ,car in gear, VTEC will engage between 2100 and 2200 rpms. Same goes for the A1.

F23A1 and A4 use a very unique form of variable engagement for VTEC as opposed to the vast majority of Honda Motors.

 

It kicks in 2,300-3,200 rpms depending on vehicle speed, manifold neg. pressure, coolant temp, oil pressure to name a few. If he drives like a granny or a racer it doesn't matter you cant hear/feel it in the f23's anyways, its an economy purpose vtec. The torque is 2 less than the a1 if I remember correctly, its very close to the a1 torque. The difference between a normal accord and a ulev accord is not noticable speedwise, a difference that small is present in identical motors in most cars...

Turbo ftw

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 5spdcoupe &raquo;</TD></TR><TR><TD CLASS="quote"> If he drives like a granny or a racer it doesn't matter you cant hear/feel it in the f23's anyways, its an economy purpose vtec. </TD></TR></TABLE>

i beg to differ, i have the f23a1 w/ intake/header/exhaust, and i can hear the crossover @ low and high rpm's... but yea, you're 95% right about feeling it kick in.

 

Provided the majority of the variables that you mentioned are correct, and the rpms are above 2200, it will engage when ever you reach a certain throttle position. It does not have a definate point in which it crosses over.

It can easily be heard, but being that it IS an economy VTEC system, there's not much in the way of a 'kick' at engagement. At a low 2200rpms, it's a smooth transition, however, if you begin to raise the engagement point, it becomes very noticeable, both audible and in feel. It's simply more efficient for it to engage low as it does stock, providing a smooth power band and more power down low.

Some people believe that they are getting more power by making it engage above ~4000. But in reality, they're just feeling the effect of having less low end without it, and a harsher engagement.

 

mmm maybe you can hear yours, i have i/h only i'm guessing the exhaust may have made it more audible in your car. personally the only thing i can notice is when i hit the powerband at 4,500+ rpms, thats always a good sound

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 5spdcoupe &raquo;</TD></TR><TR><TD CLASS="quote">mmm maybe you can hear yours, i have i/h only i'm guessing the exhaust may have made it more audible in your car. personally the only thing i can notice is when i hit the powerband at 4,500+ rpms, thats always a good sound </TD></TR></TABLE>

I just put a brand new f23a1 in my accord with only an AEM SRI. Exhaust would make VTEC engagement LESS audible, because ours only affects the intake lobes. The powerband you're talking about is simply a torque peak that starts around 4200rpms.

Here's a dyno of a stock '00 coupe. F23A4 5-speed on a dynojet. Notice how the torque curve very closely represents what your "butt dyno" probably feels. VTEC engagement on this dyno run was not visible because the driver was already above the ~2200 rpm mark after gearing up into 4th gear.

 

good call on the exhaust, makes sense

yea i was talkin bout the peak torque then, thats the only noticable thing i feel when i drive my car. everything seems to finally come alive there. highly tuned butt dyno ftw

 

come on ppl its an economy VTEC system. there no real kick or engagement. nothing like real vtec found on b16/b18c1/c5/ k20a2

its just like the fake vtec system found on the ep3 civic hatch backs and base rsx's


Modified by riceball777 at 6:04 AM 7/9/2007

 

What is "fake vtec?"

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 5spdcoupe &raquo;</TD></TR><TR><TD CLASS="quote">What is "fake vtec?"</TD></TR></TABLE>
its the vtec that is made to save gas and not for high rpm high performance.
its when the engine is running at low rpms (not in vtec) the cam lobe is so small that it only opens 1 intake valve so it saves gas. then when the fack (economy) vtec is engages the other intake cams opens.

so its not high performance. theres not like a normal size cam lobe and another huge lobe for vtec.

but instead there a cam lobe that is almost round so the intake cam stays closed and the vtec cam lone is just a normal size lobe

 

ahh, gotcha. thats the only vtec i know in detail tho